How do i connect sky to my home theater (dvd in home theater)

Hi
how do i connect my sky box to the surond sound and listen to sky through the surrond sound?

i have a sony suround sound with bulit in dvd and that only goes through the yellow socket on the front that give picture just for dvd.

i have a goodmans tv with scart sockets and them sockets on the front the white red and yellow ones.

please help me
cheers merry christmas
from Nile